# CALIBRATION OF DP LEVEL TRANSMITTER (ELEVATION) :

**In this article, we will we discussing Calibration of the DP transmitter when the transmitter installed above 0% level.**

**(1) DRY LEG**

**Let, consider the above-stated example in which we have a height from the centre to centre tapping is 5470 mm and the height from 0% to HP connection is 1250 mm.**

__1. Calculate Range :__

** Range = centre to centre (0% to 100%) * S.G.**

** = 5470 * 1.12**

** Range = 6126.4 mmH20**

__2. Calculate LRV :__

** LRV = HP - LP**

** = (1.12 * (-1250)) - 0 **

**(Here transmitter installed in elevation so we have minus the height and in** **suppression,** **we have to add that height.)**

** LRV = -1400 mmH20**

__3. Calculate URV :__

** URV = LRV + Range**

** = 6126.4 - 1400**

** URV = 4726.4 mmH2o**

**(2) WET LEG**

**Now let consider same example as above with this time for wet leg having a** **specific gravity of 1.17**

__1. Calculate Range :__

** Range = centre to centre (0% to 100%) * S.G.**

** = 5470 * 1.12**

** Range = 6126.4 mmH2o**

__2. Calculate LRV :__

** ****LRV = HP - LP **

** = (-1250 * 1.12) - (4490 * 1.17) **

** (Due to wet leg and elevation height is 5470 + 270 - 1250 = 4490)**

** = - 1400 - 5253.3**

** LRV = -6653.3 mmH2o**

__3. Calculate URV :__

** ****URV = LRV + Range**

** = -6653.3 + 6126.4**

** URV = -526.9 mmH2o**

**After calculation of LRV and URV put this value in the transmitter.**